A sample of automobiles traversing a certain stretch of highway is selected. Each one travels at roughly

Question:

A sample of automobiles traversing a certain stretch of highway is selected. Each one travels at roughly a constant rate of speed, although speed does vary from auto to auto. Let x = speed and y = time needed to traverse this segment of highway. Would the sample correlation coefficient be closest to .9, .3, 2.3, or 2.9? Explain.